<?php
    // +----------------------------------------------------------------------
    // | ThinkPHP [ WE CAN DO IT JUST THINK ]
    // +----------------------------------------------------------------------
    // | Copyright (c) 2006~2017 http://thinkphp.cn All rights reserved.
    // +----------------------------------------------------------------------
    // | Licensed ( http://www.apache.org/licenses/LICENSE-2.0 )
    // +----------------------------------------------------------------------
    // | Author: liu21st <liu21st@gmail.com>
    // +----------------------------------------------------------------------
    namespace think\response;

    use think\Request;
    use think\Response;

    class Jsonp extends Response {
        // 输出参数
        protected $options     = [
            'var_jsonp_handler'     => 'callback',
            'default_jsonp_handler' => 'jsonpReturn',
            'json_encode_param'     => JSON_UNESCAPED_UNICODE,
        ];
        protected $contentType = 'application/javascript';

        /**
         * 处理数据
         * @access protected
         * @param mixed $data 要处理的数据
         * @return mixed
         * @throws \Exception
         */
        protected function output($data) {
            try {
                // 返回JSON数据格式到客户端 包含状态信息 [当url_common_param为false时是无法获取到$_GET的数据的，故使用Request来获取<xiaobo.sun@qq.com>]
                $var_jsonp_handler = Request::instance()->param($this->options['var_jsonp_handler'], "");
                $handler           = !empty($var_jsonp_handler) ? $var_jsonp_handler : $this->options['default_jsonp_handler'];
                $data              = json_encode($data, $this->options['json_encode_param']);
                if ($data === false) {
                    throw new \InvalidArgumentException(json_last_error_msg());
                }
                $data = $handler . '(' . $data . ');';
                return $data;
            } catch (\Exception $e) {
                if ($e->getPrevious()) {
                    throw $e->getPrevious();
                }
                throw $e;
            }
        }
    }
